The anthracite with an ash content of 3.56% was used to prepare ultra-low ash coal using a novel triboelectric separator with zigzag separation chamber in this study. The composition, density composition, and size distribution of coal sample were analyzed. Effects of voltage, airflow, and feed rate on triboelectric separation of coal were investigated. The results show that the ash content of ultra-low ash decreases with the voltage increase and reduces at lower airflow and then presents a rising trend with the increasing airflow. However, the effect of feed rate is not significant. The ultra-low ash coal with an ash content of 1.83% is obtained with 64.54% yield at 80 kV voltage, 70 m(3)/h airflow, and 75 Hz feed rate.